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ppmtoilbm - convert a portable pixmap into an ILBM file
ppmtoilbm
[-maxplanes|-mp N] [-fixplanes|-fp N] [-ham6|-ham8] [-dcbits|-dcplanesrgb] [-normal|-hamif|-hamforce|-24if|-24force|
-dcif|-dcforce|-cmaponly] [-ecs|-aga] [-compress|-nocompress] [-cmethod type] [-mapppmfile]
[-savemem] [ppmfile]
Reads a portable pixmap as input. Produces
an ILBM file as output. Supported ILBM types are:
- Normal ILBMs with 1-16
planes.
- Amiga HAM with 3-16 planes.
-
- 24 bit.
- Color map (BMHD + CMAP chunk
only, nPlanes = 0).
- Unofficial direct color.
- 1-16 planes for each color component.
- Chunks written:
- BMHD, CMAP, CAMG (only for HAM), BODY (not for colormap
files) unofficial DCOL chunk for direct color ILBM
Options marked
with (*) can be prefixed with a "no", e.g. "-nohamif". All options can be abbreviated
to their shortest unique prefix.
- -maxplanes | -mp n
- (default 5, minimum 1,
maximum 16) Maximum planes to write in a normal ILBM. If the pixmap does
not fit into <n> planes, ppmtoilbm writes a HAM file (if -hamif is used),
a 24bit file (if -24if is used) or a direct color file (if -dcif is used)
or aborts with an error.
- -fixplanes | -fp n
- (min 1, max 16) If a normal ILBM
is written, it will have exactly <n> planes.
- -hambits | -hamplanes n
- (default
6, min 3, max 16) Select number of planes for HAM picture. The current
Amiga hardware supports 6 and 8 planes, so for now you should only use
this values.
- -normal (default)
- Turns off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce
and -cmaponly. Also sets compression type to byterun1.
- -hamif (*)
- -24if (*)
- -dcif (*)
- Write a HAM/24bit/direct color file if the pixmap does not fit
into <maxplanes> planes.
- -hamforce (*)
- -24force (*)
- -dcforce (*)
- Write a HAM/24bit/direct
color file.
- -dcbits | -dcplanes r g b
- (default 5, min 1, max 16). Select number
of bits for red, green & blue in a direct color ILBM.
- -ecs (default)
- Shortcut
for: -hamplanes 6 -maxplanes 5
- -aga
- Shortcut for: -hamplanes 8 -maxplanes 8
- -ham6
- Shortcut for: -hamplanes 6 -hamforce
- -ham8
- Shortcut for: -hamplanes 8
-hamforce
- -compress (*) (default)
- -cmethod none|byterun1
- Compress the BODY
chunk. The default compression method is byterun1. Compression requires
building the ILBM image in memory; turning compression off allows stream-writing
of the image, but the resulting file will usually be 30% to 50% larger.
Another alternative is the -savemem option, this will keep memory requirements
for compression at a minimum, but is very slow.
- -map ppmfile
- Write a normal
ILBM using the colors in <ppmfile> as the colormap. The colormap file also
determines the number of planes, a -maxplanes or -fixplanes option is ignored.
- -cmaponly
- Write a colormap file: only BMHD and CMAP chunks, no BODY chunk,
nPlanes = 0.
- -savemem
- See the -compress option.
HAM pictures will always
get a grayscale colormap; a real color selection algorithm might give better
results. On the other hand, this allows row-by-row operation on HAM images,
and all HAM images of the same depth (no. of planes) share a common colormap,
which is useful for building HAM animations.
Amiga ROM Kernel
Reference Manual - Devices (3rd Ed.)
Addison Wesley, ISBN 0-201-56775-X
ppm(5)
, ilbmtoppm(1)
Copyright
(C) 1989 by Jef Poskanzer.
Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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